Bio 449 Lecture 21 Oct. 25, 2010

Cardiovascular Physiology IIIBlood flow (cont'd)Control of blood distribution (conclusion)Regulation of arteriolar diameter Capillary function Lymphatic system

Respiratory Physiology IOverview of ventilation and circulation Structure of mammalian pulmonary system Airway divisionsAlveolar structure and function

Terms to KnowUltrafiltrateLymphLymphatic systemLymphatic vesselsEdema Gas exchangeVentilation PharynxLarynxEpiglottisTracheaBronchus (pl. bronchi)BronchioleAlveolus (pl. alveoli) Thoracic cavityDiaphragmPleural membraneIntrapleural fluid

ReadingsLectures 21-22: Chapter 17

Terms to KnowVasodilationVasoconstriction Active hyperemiaNitric oxide

Control of blood distribution

Fig. 15-15

Regulation of arteriolar diameter

Capillary function

Movement across capillary walls

Similar to Fig. 15-17

Lymphatic system

Lymph capillary

Overlappingendothelial cellsInterstitial

fluid

Lymph

Uptake of lymph

Arteriole

Netabsorption

Lymphvessels

Netfiltration

Venule

Fig. 15-19

Lymphatic system

Fig. 15-19

Spleen

Lymph nodes

Thymus

Blind-end lymphcapillaries

Lymph fluid empties into superior vena cava.

Respiratory Physiology

Overview of ventilation and circulation

Gas exchange

Fig. 15-19

Structure of mammalian pulmonary system

Pulmonary system

Fig. 17-2

Rightbronchus

Left bronchus

Left lung Diaphragm

Upperrespiratory

system

Lowerrespiratory

system

Right lung

TracheaLarynx

Vocal cords

Pharynx

Respiratory tree

Fig. 17-2

Bronchiole

Trachea

Cartilagering

Larynx

Secondarybronchus

Left primarybronchus

Alveoli

Alveoli

Fig. 17-2

Bronchiole

Smooth muscle

Capillary beds

Elasticfibers

Alveoli

Branch ofpulmonary artery

Branch ofpulmonary

vein

Lymphaticvessel

Gas exchange

Fig. 17-2

Fusedbasement

membranes

Alveolarair space

Plasma

Alveolarepithelium

~1 μm

Surfactant

Endothelium

RBC

Capillary

Alveolus

Pleural cavities

Fig. 17-2

Right lung

Pericardialcavity

Right pleuralcavity

Pleuralmembranes

Left pleuralcavity

Left lung

Heart